arcsinh(sec(x)*tanh(x))=x+20/5!*x^5-280/7!*x^7+18000/9!*x^9...

A012836

arcsinh(sec(x)*tanh(x))=x+20/5!*x^5-280/7!*x^7+18000/9!*x^9...

Terms

    a(0) =1a(1) =0a(2) =20a(3) =-280a(4) =18000a(5) =-1277760a(6) =159922880a(7) =-26119949440

External references